﻿#include "McuModbusSlaver.h"


#define MB_MEG2(a,b)		   ((uint16_t)a << 8) & 0xff00 | ((uint16_t)b & 0xff)
#define MB_MEG4(a,b,c,d)	((uint32_t)a << 24) & 0xff000000 | ( (uint32_t)b<< 16) & 0xff0000 | ( (uint32_t)c<< 8) & 0xff00 |  (uint32_t)d & 0xff

enum ModbusErrCode
{
	MODBUS_ERR_CODE_SUCCESS = 0,
	MODBUS_ERR_CODE_ILLEGAL_FUNCTION_CODE = 1,
	MODBUS_ERR_CODE_ILLEGAL_DATA_ADDRESS = 2,
	MODBUS_ERR_CODE_ILLEGAL_DATA_CONTENT = 3,
	MODBUS_ERR_CODE_SUB_STATION_EQUIPMENT_ERROR = 4,
	MODBUS_ERR_CODE_SUB_STATION_BUSY = 6,
	MODBUS_ERR_CODE_CRC_CHECK_ERR = 7 
};


enum ModbusFunCode
{
	MODBUS_FUN_CODE_03 = 3,
	MODBUS_FUN_CODE_06 = 6,
	MODBUS_FUN_CODE_16 = 16,
	RPC_FUNC_CODE = 100
};





const uint8_t auchCRCHi[] = {
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
	0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
	0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
	0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
	0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
	0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
	0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
	0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
	0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
	0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
	0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
	0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
	0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
	0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
	0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
};

const uint8_t auchCRCLo[] = {
	0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06,
	0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD,
	0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09,
	0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A,
	0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4,
	0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
	0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3,
	0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4,
	0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A,
	0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29,
	0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED,
	0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
	0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60,
	0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67,
	0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F,
	0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68,
	0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E,
	0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
	0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71,
	0x70, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92,
	0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C,
	0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B,
	0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B,
	0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
	0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42,
	0x43, 0x83, 0x41, 0x81, 0x80, 0x40
};



uint16_t McuModbusCrc(uint8_t* buf, uint32_t len)
{
	uint8_t uchCRCHi = 0xFF;
	uint8_t uchCRCLo = 0xFF;
	unsigned long uIndex;

	while (len--)
	{
		uIndex = uchCRCHi ^ *buf++;
		uchCRCHi = uchCRCLo ^ auchCRCHi[uIndex];
		uchCRCLo = auchCRCLo[uIndex];
	}

	return (uchCRCHi << 8 | uchCRCLo);
}


McuModbusSlaver::McuModbusSlaver() {

	m_byteLen = 0;

}

McuModbusSlaver::~McuModbusSlaver() {
	
}


uint8_t McuModbusSlaver::ReadOrWrite(int isRead, uint16_t ddaId, uint8_t* buf, uint16_t bufLen) {
	uint16_t	   memId = 0;
	uint16_t	   memDataType = 0;

	return 0;
}



uint8_t McuModbusSlaver::Fun06() {
	if (ReadOrWrite(0, m_startAddress, &m_reqBuffer[4], 2) > 0) {
		return 1;
	}
	if (m_reqBuffer[0] > 0) {
		//m_pCommDriver->Send(m_reqBuffer, m_reqBufferLen);
	}
	return 0;
}

uint8_t McuModbusSlaver::Fun16() {
	uint8_t inx = 0;
	m_resBuffer[inx++] = m_reqBuffer[0];
	m_resBuffer[inx++] = m_reqBuffer[1];
	m_resBuffer[inx++] = m_reqBuffer[2];
	m_resBuffer[inx++] = m_reqBuffer[3];
	m_resBuffer[inx++] = m_reqBuffer[4];
	m_resBuffer[inx++] = m_reqBuffer[5];

	if (ReadOrWrite(0, m_startAddress, &m_reqBuffer[7], m_reqBuffer[6])) {
		return 1;
	}
	inx = inx + m_byteLen;
	uint16_t crc = McuModbusCrc(m_resBuffer, inx);
	m_resBuffer[inx++] = crc >> 8;
	m_resBuffer[inx++] = crc & 0xff;
	if (m_reqBuffer[0] > 0) {
		//m_pCommDriver->Send(m_resBuffer, inx);
	}
	return 0;
}

uint8_t McuModbusSlaver::Fun03() {
	uint8_t inx = 0;
	m_resBuffer[inx++] = m_reqBuffer[0];
	m_resBuffer[inx++] = m_reqBuffer[1];
	m_resBuffer[inx++] = m_byteLen;
	if (ReadOrWrite(1, m_startAddress, &m_resBuffer[inx], m_byteLen)) {
		return 1;
	}
	inx = inx + m_byteLen;
	uint16_t crc = McuModbusCrc(m_resBuffer, inx);
	m_resBuffer[inx++] = crc >> 8;
	m_resBuffer[inx++] = crc & 0xff;
	if (m_reqBuffer[0] > 0) {
		//m_pCommDriver->Send(m_resBuffer, inx);
	}
	return 0;
}



uint16_t McuModbusSlaver::Import(uint8_t* buf, uint16_t bufLen) {
	if (bufLen < 8) {
		return 0;
	}
	if (buf[0] != m_slaveAddr && buf[0] != 0 && buf[0] != 247) {
		return 0;
	}
	switch (buf[1]) {
	case MODBUS_FUN_CODE_03:
	case MODBUS_FUN_CODE_06: {
		if (bufLen != 8) {
			return 0;
		}
		break;
	}
	case MODBUS_FUN_CODE_16: {
		if (bufLen != buf[6] + 9) {
			return 0;
		}
		break;
	}
	case RPC_FUNC_CODE: {
		if (bufLen > 8) {
			int packLen = MB_MEG2(buf[7], buf[6]);
			if (bufLen != packLen + 8) {
				return 0;
			}
		}
		break;
	}
	default: {
		return 0;
	}
	}
	uint16_t rightCrc = McuModbusCrc(buf, bufLen - 2);
	uint16_t returnCrc = (buf[bufLen - 1] + (buf[bufLen - 2] << 8));
	if (rightCrc != returnCrc) {
		return 0;
	}
	//m_reqBufferLen = m_pCommDriver->Receive(m_reqBuffer, bufLen);
	return m_reqBufferLen;
}


void McuModbusSlaver::Exec()
{
	uint8_t  errCode = MODBUS_ERR_CODE_SUCCESS;
	m_startAddress = MB_MEG2(m_reqBuffer[2], m_reqBuffer[3]);
	m_byteLen = MB_MEG2(m_reqBuffer[4], m_reqBuffer[5]) * 2;
	if (m_reqBuffer[1] == 0x03 && m_byteLen > 128) {
		errCode = MODBUS_ERR_CODE_ILLEGAL_DATA_ADDRESS;
	}
	if (errCode == MODBUS_ERR_CODE_SUCCESS) {
		uint8_t execRessult = 0;
		switch (m_reqBuffer[1]) {
		case MODBUS_FUN_CODE_03:  execRessult = Fun03(); break;
		case MODBUS_FUN_CODE_06:  execRessult = Fun06(); break;
		case MODBUS_FUN_CODE_16:  execRessult = Fun16(); break;
		default: {
			errCode = MODBUS_ERR_CODE_ILLEGAL_FUNCTION_CODE;
		}
		}
		if (execRessult != 0) {
			errCode = MODBUS_ERR_CODE_SUB_STATION_EQUIPMENT_ERROR;
		}
	}
	if (errCode != MODBUS_ERR_CODE_SUCCESS && m_reqBuffer[0] > 0) {
		uint8_t inx = 0;
		m_resBuffer[inx++] = m_reqBuffer[0];
		m_resBuffer[inx++] = 0x80 + m_reqBuffer[1];
		m_resBuffer[inx++] = errCode;
		uint16_t crc = McuModbusCrc(m_resBuffer, inx);
		m_resBuffer[inx++] = crc >> 8;
		m_resBuffer[inx++] = crc & 0xff;
		//m_pCommDriver->Send(m_resBuffer, inx);
	}
	return;
}
